I have just recently created a Shelfari account and linked it to my blog. I really found Shelfari useful because you can keep track of the books you have read. Not only can you do that, you can show what you are currently reading and what you plan to read. Shelfari allows you to make friends, chat with people, and share your Shelfari shelf. I really enjoyed it, and I highly recommend making your own account on Shelfari. Start reading!